Don’t ignore it, but step away from it.
Let it congeal in the back of your mind.
Look at it from a different angle.
Look at it from the wrong angle.
As you walk by it, give it a kick to see if it is still there.
But don’t engage it.
Wait until you’ve got the approach in your head all laid out – it will come to you – when you least expect it – it will come to you.
But it won’t whilst you are staring at it in the face wishing it would solve itself for you.